I like larger squads, so I would add another 5 Blood Claws and another 5 Grey Hunters before getting some Long Fangs for some ranged support. The Blood Claws need a delivery system, so a drop pod or rhino might be a good idea. I also prefer the flamer to the plasma pistol on blood claws because there is no roll to hit (WS3 is not really different from WS4 as far as offense goes, but a 15 point plasma pistol seems to be too expensive for a BS3 model).

If the appeal is the stuff that Space Wolves have that nobody else has the Stormfang gunship or Venerable Dreadnought with the axe and shield could make cool centerpieces for the army if one wants vehicles, or perhaps a Wolf Priest, Rune Priest, or both, to take advantage of the Wolves Unleashed formation. Thunderwolf cavalry is also both good in-game and Space Wolf exclusive if one can get over the goofiness.